AVR-Chat

the amp has to be something that can be placed on a pcb and controlable on/off with an mcu. its a plus if gain is also controllable.


--- On Sun, 6/22/08, BobGardner@aol.com <BobGardner@aol.com> wrote:

From: BobGardner@aol.com <BobGardner@aol.com>
Subject: Re: [AVR-Chat] Audio power amp and vibration sensor
To: AVR-Chat@yahoogroups.com
Date: Sunday, June 22, 2008, 8:48 PM






You need a regular old car stereo amp and an accelerometer.


In a message dated 6/22/2008 1:34:02 A.M. Eastern Daylight Time, 
xolang1@yahoo. com writes:

hello,

I have 2 requirements that i hope someone could help me on:

1) I have a certain circuit that is able to drive an 8Ohm speaker with a 
maximum output of 1watt. the voltage output is measured from 0 to 5V. The sound 
however , is quite soft and I need to install this inside a vehicle which is 
expected to be noisy. I need this audio output to be amplified to some good 
degree (about 10 - 20watts to my estimate). The Amp has to be of high fidelity 
as the output is not of the best quality. My problem is I am not familiar 
with audio circuitry and there seem to be numerous solutions on the web. can 
anyone recommend a good solution, possibly 1 single chip solution that does all 
the analog handling and is powerful enough to drive a 10 - 20w speaker. 
Also, is it possible to connect the speaker ouput of my current set up to this 
amp dirrectly without worrying about impedances etc?
???
audio circuit----- (output is good for 8Ohm skr)-------- --------- ----->10- 20w 
Power Amp

2) I need a vibration sensor that is able to detect strong vibrations in a 
vehicle (e.g. when the tires hit a hump). ideally this solution in also single 
chip.output could be a simple ttl logic or analog voltage. 

If possible, solutions that can be bought individually like from arrow / 
digikey would be best as this is only for hobby-grade.

any help is much appreciated.

- Chris

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